Rockwell Automation GMLC Reference Manual - Manual (Page 736)

Publication GMLC-5.2 - November 1999
Using the Dedicated Discrete Outputs 699
Axis Locked
The axis locked output for each axis (SLC or PLC inputs 0 – 3) is set
whenever both the axis is locked onto its command position and no faults
are active on the axis. Otherwise, axis locked output is cleared.
An axis is locked whenever either of the following two sets of conditions
are true:
• Electronic gearing is OFF , and no position-lock cam or interpolated
motion is in progress:
• No motion (move, jog, or time-lock cam) in progress.
• Position error
≤
position lock tolerance.
• Electronic gearing is ON , or position-lock cam or interpolated motion
is in progress:
• Position error
≤
position lock tolerance.
• Ramp to Master Speed is selected in the Electronic Gearing
block.
The position lock tolerance is set in the Positioning page of the Configure
Axis Use dialog box and specifies how much position error the motion
controller tolerates in a locked condition. As such, it is one of the factors
that determines positioning accuracy. See the Installation and Setup
Manual for your controller, or Online Help for more information on
position lock tolerance.
These bits are identical to the Lock_status Axes System variables in GML
Commander. See the Status Variables chapter of this manual for more
information on Lock_status.